The Filters tab contains a set of filters that allow users to specifically reduce the number of vessel detections displayed based on specific monitoring criteria.

For more information about each of the remote sensing/vessel detection capabilities, see the Vessel Detection Events section.

For each of these filters, selecting no filters is the same as selecting all filters.

Detection Type

The type filter allows you to select between sensor types and satellites.  

AIS Correlation

Vessel detections are correlated to AIS () or considered ‘dark’ (not correlated to AIS) (). A ‘dark’ detection may occur for several reasons: vessel may not transmit AIS at all, a common AIS gap, a vessel has turned off its AIS or simply that Skylight was not able to correlate the detection to AIS with enough confidence (e.g., multiple vessels in the nearby vicinity).

Selecting one or the other (Correlated, Dark) will reveal only those events on the map.

Estimated Vessel Length

The estimated vessel length intends to provide a general estimate of size (small, medium, large). Precise estimates are not suitable to most satellite imagery with low-medium resolution and sensor types that create noise in the image (e.g., Satellite Radar) that can make automated estimates difficult.

The filter only applies to Sentinel-2 data.